以下为句子列表：
英文: As the war went on, counter-espionage officials developed ways of spotting suspicious letters.
中文: 随着战事推进，英国反间谍工作人员总结出了许多破解可疑信件的方式。
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英文: Counter-espionage and security work were to occupy most of Walter's time for the next four years.
中文: 和间谍遭遇战以及秘密工作占据了沃特随后四年的大部分时间。
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英文: They posted the letters to their handlers, hoping that counter-espionage experts would be fooled by the seemingly innocent pictures.
中文: 间谍将藏有机密的信件送到邮局，他们希望这些看上去毫无意义的图案能骗过盟军的眼睛。
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